[issue46081] Document the msg argument for assertRaises

[Eric V. Smith]

Eric V. Smith <eric at trueblade.com> added the comment:

The documentation at https://docs.python.org/3/library/unittest.html says "All the assert methods accept a msg argument that, if specified, is used as the error message on failure (see also longMessage). Note that the msg keyword argument can be passed to assertRaises(), assertRaisesRegex(), assertWarns(), assertWarnsRegex() only when they are used as a context manager."

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nosy: +eric.smith

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